Newborn screening

Across New Zealand, newborn screening tests have been available to all babies soon after birth for many decades. These tests are a way to ensure early detection – and subsequent treatment – for a number of rare but important conditions that affect a small number of babies.

Taking the newborn screening test

The newborn screening test is carried out on a blood sample obtained by a heel prick. It is recommended that this happens when the baby is between 48-72 hours old. Because the time spent in hospital after the birth of a baby is the only certain opportunity for testing, if the baby is discharged before 48 hours, it is important that the test is carried out before the baby leaves the hospital and then again, in the community, as soon after 48 hours as possible. Be aware that false positives and negatives can sometimes occur when the screening tests are done before 48 hours.

Results of the newborn screening test

Initial test results are usually available within 24 hours of the sample being received in the laboratory. Parents of babies whose test results show any of the disorders present will be notified and booked in for further testing.

Test results for Cystic Fibrosis (CF)

Newborn screening for CF involves several different tests. Don’t expect an instant result - it takes between 4 to 6 weeks. There are 3 possible outcomes: very low risk, increased risk and affected. Parents/guardians of babies who are at increased risk or affected with CF are referred to a genetic counselor for appropriate follow up and management.

Be aware that hospital staff need to obtain verbal consent from parents or guardians before performing the test and this is then documented – along with the results of the subsequent test – on your baby’s hospital file.

If you wish to refuse the test on behalf of your baby, you would generally be referred to a newborn screening counselor for further discussion.